Magnetic pick-up for riveting-machines.



D. G. SASSEMAN. MAGNETIC PICK-UP FOR RIVE'IING MACHINES.

APPLICATION FILED FEB.23, 1012.

Patented Nov. 18, 1913.

Fla V4 III --L/ ll r r llll' \waj J66 m gm UNEZTEU @iilrtillliiltiiDAVID C. SASSEMAN, O1 RIVER liOlEtESfll, ILLINOIS. .f'

FACTURING COMPANY, OF CHICAGO, ILLINOIS, it COBLPOEE "il tOiit FlttilEvSSIGNOF TO 1 H. $l flfITI-3f ll'l'ANU- i ION OT." ILLINOIS.

MAGNETIC PICK-UP HIV]?TING--MACHINES.

LOWDJAW).

To all QU/LOHL it may concern Be it known that I, DAVID C. tiassmiax, acitizen of the United States, residing at River Forest, in the county of(Tool: and State oit Illinois, have invented certain new and usefulImprovements in hlagnctic Pick- Ups t'or liiveting-lviachines, (it whichthe following a specification, reili'erence being had to theaccompanying drawings, forming a part thereof.

The purpose of this invention is to provide an improved pick-up devicefor positioning rivets or like fittings in a riveting machine.

It consists of the elements and features oil construction described andshown in the drawings as indicated in the claims.

In the drawings:liigure 1 is a side elevation partly in section of ariveting machine fitted with a device embodying this invention. Fig. 2is a detail view in section showing a modified form of the device. Fig.3 is a detail section taken as indicated at line 3--3 on Fig. 2.

The riveting machine or hammer shown in Fig. 1 comprises a familiar formof C- shaped frame, A, carrying a clenching anvil, B, on its lower armand a. plunger, O, in its upper arm, mounted for reciprocation towardand from the anvil, B. The upper end of the plunger, 0, is provided witha wearing shoe of hard metal, I), upon which the operating cam, E,bears, and against the under side of which a returning spring, F,operates. The body of the plunger C composed of brass or some othernon-mag netic metal and has inserted into its lower end a magnet, G,which constitutes the pickup device for the rivets which are to be usedin the machine. By virtue of a slot, G extending throughout the greaterpart of the length of the magnet, G, and also by reason of the method ofmagnetization the said magnet is of the horse-shoe or double pole type,having its two opposite poles, G G in close proximity but separated by asmall air gap at, G As will be well un derstood, the efficiency of thistype oili magnet is much greater than that ol the more usual bar magnetemployed tor this purpose, in which only one of the poles is put towork; in consequence of this arrangement the entire pulling power of themagnetic force stored in the magnet, G, is exerted upon any objectapplied to the poles. Pref- Specification ot Letters Patent.

Application filed Fehruary 1912.

'intrntcd Nov. lei, wit-i.

Serial No. 6793 10.

rably though not necessarily, the slot, G, is made considerably widerthrimghout the greater part ol' its length than in the \i(lll' ity oithe poles. (t, (i This re ults in an intensification oi the in gneliclicld in the vicinity o'l lhc poles by reason ol the reduccd air gap,ii, at this point which attords the path oi least resistance to thepassage cl the magnetic lines o'li Force as compared with all otherpossible paths. Although the plunger with its magnet, (i, moves in aguide-way ot the magnetic iron trance- A, the lllichncs's oi, theinsulating walls, t), oil the non-magnetic plunger, C, is such that onlyby traversing the air gap, (:i, will the lines o'l? force encounter theminimum of non-huurnelic medium. Thus when a steel rivet such as thatimlicated at, H, is brought within the llcld, o'l inllucncc ol' themagnet, (i, it is readily and :-=trongly attracted thereby and willremain in contact therewith until the riveting operation is cinnpletcd.'lo assist in properly centering the head oi the rivet upon the end ofthe plunger the walls, C, of the latter are arranged to extend slightlybeyond the end of the magnet poles at, (i the result being a cup-shapcdend tor the plunger, and it desired the poles of the magnet its-ell maybe cupped out as indicated at, (i For more accurately engaging rivetswhich are lnadc with convexly rounded heads.

In Figs. 2 and 3 there is illustrated a modified form ot magnet which isperhaps thcoretirailly 1'norc nearly ideal than that shown in Fig. 1,but which may not always be found so desirable trom a constructhmalstandpoint. It is C-shaped in outline so that the space between its armswhich corresponds to the space, G in Fig. 1 becomes in this casepreferably circular, affording the least possible op mrtunity fordissipation of the magnetic force by the creation of a magnetic fieldelsewhere than at the poles. This magnet is shown loiilgcd in abifurcated plunger of non magnetic material with a lmshing, G, oil. suchmaterial occupying the circular space within the magnet. In this casethe Frame, A, is cut away sulliciently a t, A to pre vent contact oi.the magnet, G, with the :lramc, A, and to insure a sulliciently wide airgap as compared with the air gap, G, between the poles.

I claim 1. In a riveting machine, the combination of a frame of magneticmetal and a driver guided for movement therein, comprising a two-polemagnet consisting of a bifurcated bar with its poles disposed side byside at the driving end, and a carrier for said magnet of non-magneticmetal constituting a sheath which surrounds the poles of the magnet, theair gap between said magnet poles being less than. the shortest possiblepath connecting them through said nonmagnetic sheath,

2. In a riveting machine, the combination of a frame of magnetic metal,and a driver guided for movement therein comprising a carrier of nonmagnetic material, and a twopole magnet consisting of a bifurcated barwith its poles disposed side by side at the bifurcated end, the spacebetween the two limbs being least in the vicinity of said poles and suchmagnet being secured in a socket in the end of the carrier with itspoles exposed.

3. In a riveting machine, a driver comprising a carrier of non-magneticmaterial, and a two-pole magnet secured therein having its polesdisposed side by side at the driving end, the material of the carrierextending alongside the said poles and slightly beyond them.

In a riveting machine the combination of a frame of magnetic metal and adriver guided for movement therein, comprising a carrier of non-magneticmaterial, and a twopole magnet consisting of a bifurcated bar with itspoles disposed side by side at the driving end, said magnet beingslightly sunk in the end of the carrier to permit protrusion of thenon-magnetic material thereof beyond the poles of the magnet.

in testimony whereof I have hereunto set my hand at Chicago, Illinois,this 20th day of February, 1912.

DAVID C. SASSEMAN.

,"Vitnesses: i Rom. l BURTON,

EDNA M. MAolNTosI-I.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner 5:: Patents, Washington, D. C."

